Rocker arm



Dec. 11, 1923.

. J. F. KYTLICA ROCKER ARM Filed Feb, 12,- 1923 Patented Dec. 11, 1923.

JOHN F. KYTLICA, OF CHICAGO, ILLINOIS.

ROCKER ARM.

Application filed February 12, 1923. Serial No. 618,508.

cago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Rocker Arms, of which the following is a specification.

This invention relates to improvements in rocker arms in general, but'particularly to that type of such arms employed in the operating mechanism for the valves of engines, and it consists in certain peculiarities of the construction, novel arrangement and combination of the parts thereof as will be hereinafter more fully set forth and specifically claimed.

The principal object of the invention, is the provision of a very simple and inexpensive, yet highly efiicient rocker arm, which while being shown in the accompanying drawing in connection with a portion of an engine and valve operating mechanism thereof, and will be hereinafter so referred to, yet it is applicable for use for other purposes without departure from the spirit of the invention, and for this reason I wish it to be understood the invention is not limited in its application to any specific use or purpose except where so specified in the claims hereto attached.

Another object of the invention is the provision of means whereby the rocker arm will be so mounted or pivoted that friction incident to its hearings, will be greatly reduced or practically eliminated, andthe actuation of the arm rendered extremely sensitive;

Still another object is to so construct certain bearing parts of the arm that after becoming worn from :usa'ge, they can be readily ground or put in substantially their original condition with a minimum amount of labor. 1

' A still further object is the provision of means for yieldingly, automatically and accurately holding the arm on its pivot or bearing.

In the accompanyingv drawing, which serves to illustrate an embodiment of the invention Y Fig. 1 is a plan view of a pair of rocker arms constructed and mounted according to my invention.

Fig. 2 is a side view thereof showing a fragment of the upper portion of the engine on which the rocker arms are mounted, and

Fig. 3 is a view partly in section and partly in elevation, taken on line 33 of Fig. 2 looking in the direction indicated.

by the arrows showing the bearing elements or portions of one of the rockerv arms and a art ofthe supporting base thereof.

ike numerals of reference refer to corresponding parts throughout the different views of the drawings.

p The supporting base for the rocker arms 1 is designated by the numeral 5, and as is clearly shown in Fig. 2, is secured by means of bolts 6 and nuts -7 to the upper portion of an engine 8,- which engine may be of any well known type'having'the valves thereof located on its opposite sides.

The supporting base 5 has an upright portion 9 from each side of which, is horizontally extended a V-shaped bearing or pivot member 10 on whichone of the rockera'rms 11 is mounted for oscillation. As the arms 11 and their bearing or pivot members are of the same construction, a description of one of each of them will be suificient for a clear understanding of the device. As shown in Figs. 1 and 2, therocker arm 11 has at one of. its ends an arcuate shoe 12 and at its other end an enlargement 13 which is providedin its lower surface with a socket 14 for the reception and operation of the upper end of one of the rods 15 of the valve operating mechanism, not shown, which mechanism may beof the well known or any preferred construction.

The other'of the rods 15 impinges at its upper end against the arcuate shoe 12 in the ordinary manner ofsuchrods. The arm 11 is provided midway between its ends with a transverse opening 16 which is sub stantially circular but has in its lower pertion an angular recess 17 to receive the acute angled lower portion of the pivot or bearing member v10 of the support for the arm. To give greater stability to the arm the same is provided on each of its sides around the opening 16 therein; with a cylindrical collar or boss 18 each of which has an angular recess 17 coinciding with 'or forming a part of the'angular recess above mentioned, of the arm. I I

Extended upwardly from the bosses or collars 18 is an internally screw-threaded extension 19 which communicates with the cavities of the portions 18 of the arm and is diametrically intersected by the arm 11 as is clearly shown-in Fig. l of the drawing.

Movably located in the extension 19 is a follower or plunger 20 which has its upper portion circular in shape to fit snugly in the extension 19 yet so as to move therein, and its lower portion substantially V or wedge shaped so as to fit in the angular recess 21 of the V-shaped pivot or bearing member 10 as will be readily understood by reterence to Fig. 2 of the drawing; This movable follower or plunger carries at its upper end a stem 22 which is loosely extended through an opening in a screw-plug 23 which is in threaded engagement with the extension 19 and is employed for adjusting the tension or" aspring 2% which surrounds thest-em 22 and rests at one of its ends against the inner end of the plug 23 and'at its other end against the upper surface of the plunger 20, said plunger being preferably provided with a socket 25 in its upper surface for the reception of the lower end of said spring. The plug 23 is provided with openings 26 for enga ement with a spanner wrench used for turning the plug 23 in the proper direction to regulate the tension of the spring 24 and through it the pressure oi the plunger 20 on the bearing pivot 10 for the rocker arm.

By reference to Fig. 2 it will be seen that the lower portion of the V-shaped member 10 is somewhat enlarged as at 1-0 and that the lower portion of the angular part of the follower 20 is likewise laterally enlarged as at 20 for the purpose of enabling the pointed or knife-like edges of the members 10 and 20, after becoming blunted by usage, being ground without the necessity of grinding the entire side walls of said members, thus saving considerable time and labor.

The outer end of the lower portion of the enlarged part 10 of the pivot or hearing member 10 is provided with a. vertical opening for the reception of a cotter-pin 27 used for preventing the accidental lateral dislocation of the rocker arm.

From the foregoing and by reference to the drawing, it will be readily understood and clearly seen that by my improvements the angular recess 17 or": the rocker arm will receive the knife-like edge of tie pivot or hearing member 10 for the arm and that as the follower 20 fits at its knife-like edge into the angular recess 21 of the member 10 and is yieldingly heldin such position by the tension of the spring 24 exerted upon the upper portion of the follower 20, a verysensitive and almost frictionless bearing will beprovided, and also onein which the pressure of the said follower against the said pivot member can be regulated so as to compensate for the wear of the parts incident to, usage. i

Having thus fully described my invention, what I claim as new and desire to sedure by Letters Patent is 1. In a device of the class described, the combination with a il-shaped supporting member, of a rocker arm having a transversely disposed opening surrounding said member and having the wall thereoi in contect with the apex'of said member, and means carried by the arm and extended into the recess of said supporting member for holding the arm in contact with said member.

2. In a device of theclass described, the combination with a V-shaped' supporting member, of a rocker arm having a tran versely disposed opening surrounding said K member and having the wall thereot in contact with the apex of said member, and means carried by the arm and extended into the recess of said supporting member for yieldingly holding the arm in contact with said member.

3. In a device of the class described, the combination with a V-shaped supporting member, of a-roclr'er arm having a transversely disposed opening surrounding said member and the wall of said opening hav- I1 a V-shaped recess to receive the apex of said supporting member, and means carried by the arm and extended into the recess of said supporting member for holding the arm in contact with said'member.

4; In a device of the class described, the combination with a V-shaped supporting -member, of a rocker arm having a trans versely disposed opening surrounding said member and thewall of said opening having a J-shaped recess to receive the apex of said supporting member, and means carried by the arm and extended into the recess of said supporting member for yieldingly holdingthe arm in contact with said "member.

5. In a device of the class described, the combination with a V-shaped supporting member, of a rocker arm having a trans, versely disposed opening surrounding said member and having the wall of said opening in contact with the apex of said member, a tubular extension mounted on the arm in communication with the said transverse opening, a follower movably located in said extension and having a V-shaped portion extended into the recess-of said member, a spring mounted on the follower within said extension and 1 adjustable means engagingsaid extension for adjusting the tension'of said spring.

JOHN F.' KYTLIOA. 

